Air controlling grille



Dec. 5, 1950 A. B. NEWTON 2,533,175

AIR CONTROLLING GRILLE Filed Jan. 5, 1947 5 Sheets-Sheet 1 INVENTOR. flL W/N B. NEWTON F ['13. l.

Dec. 5, 1950 A. B. NEWTON 2,533,175

AIR CONTROLLING GRILLE Filed Jan. 5, 1947 3 Sheets-Sheet 2 uuuuuuugunuuuuunuu [25% 6/ L [:57 2 a I INVENTOR.

1 14 W//v B. NEW ro/v. [j 6 wwd MM A T TOR/V5 Y6.

Dec. 5, 1950 A. B. NEWTON 2,533,175

} AIR CONTROLLING GRILLE Filed Jan. 3, 1947 3 Sheets-Sheet 5 H1. W/IV .B NEWTON.

I BY K j M MM 10 ATTOR/VE 45 Patented Dec. 5, 1950 UNITED STATES TENT E AER-@ONTROLLING GRILLE Alwin it. Newtcn-, -l)ayton, Ohio, assignor to Chrysler Corporation, Highland Park, Mich, a corporation of Delaware Application January 3, 1947, Serial No. 720,081

Claims.

This invention relates to air conditioning apparatus and more. particularly to a temperature responsive means for controlling the admission of conditioned air tea room.

Air conditioning systems adapted to provide warm air for heating, or in the alternativ cool air for cooling, are well k-nown. Such systems commonly respond to the control of one thermostat provided for a plurality of air outlets. It is an object of my invention to provide each outlet with temperature responsive means to control the admisson of air. A second means is provided to automatically control the first means so that its operative effect relative to the admission of air is reversed when coolair is supplied instead of warm air. Thus, if the first means is responsive to room temperature and adapted to automatically open and close grille members provided at the outlet, and if a second means responsive to the temperature of air being delivered by the outlet is adapted to reverse the first means the admission of air at a predetermined room temperature will be dependent upon the temperature 'ofthe incoming air. ,In the winter when warm air is being delivered to the room and a predetermined temperature is attained the first means will close the grille. the summerwhen cool air is being delivered to the room and a similarutemperature is a-ttaimid the first means will open the grille. The temperature of the air delivered will cause the second means to reverse the operative effect of the first means with the seasonal changes. I a v 'Means are provided herein to use the motion of air being deliveredby the system as the motive power for opening or closing grille members. This controls the admission of air to the room without requiring supplemental motivemeans for operating the grille members.

A further cbject'o f the invention isto provide -a novel motivemeans having a driving element which is in substantially constant motion as long as air is being provided hythe system. A novel clutch is combined with this driving element for selectively moving the grille members and controlling the direction of motion offthe grille members. y

' An' adjustment is provided so thatthe critical temperature at which the first means will be actuated is variable. I

in the drawings: V p Fig. I is 2. view in elevation of the front of a grille having the present invention applied therer- 'Fig. 2 is a sectional view takensubstantially .along line '22 of Fig. 1.

i Fig. 3 is an enlarged side elevation of the grille operating mechanism at one stage of operation.

' Fig; 4 is a similar view showing another stage of operation Fig. 5 is a front partial elevation with parts cut away to illustrate the adjusting means.

Fig. 6 is a front elevation of a modified form-of the invention.

Fig. '7 is a horizontal section on the line 1-5-1 of Fig. 6.

Fig. 8 is a vertical section taken substantial-1y on the line 8-4; of Fig. 6.

Fig. 9 is a front elevation of another form of the invention.

Fig. 10 is a vertical section taken substantially on the line iii-A9 of Fig. 9.

Fig. 11 is a vertical section taken substantially on the line H-i'l 'of Fig. 9.

Fig. 12 is an enlarged fragmentary view of the yieldable connectionillustrated in Fig. 5.

The device is shown in Figs. 1 through 5 as applied to the end of an air supply duct; Hi and comprising a perforated plate H whichmay be set flush with a room wall if desired. A movable grille or perforated plate it is held against the inner surface of plate It by springs 53 which permit vertical movement of the grille. Preferably the lower edges of the perforations in plate H and the upper edges of the perforations in grille 42 are provided with horizontal flanges I4 to impart the desired direction to the streams of air issuing from the perforations and to cause room air to flow in to with supply air from above andbelow. Other movable forms oi grilles may be substituted for that shown. a g

The grille i2 is moved up or down by the rotation of a shaft it. One meansfor effecting this movement is illustrated. The shaft {5 is threaded and passes through a threaded hole in the end of a bracket it mounted on the plate. Other driving means such as a gear train, a rotatable drum and wire may be substituted without departing from the invention. Rotation of the threaded shaft is effected by the rotation of either one of a pair or" turntables ii and i8 fixed to the upper end of the screw. The turntables are rotated by the engagement therewith of either one of a pair of drivers is and 2i! fixed to a shaft 2! which has a reaction turbine 22 thereon. The turbine is held in an opening 23 in plate I J and is rotated by air which moves therethrough as an incident to the pressure drop between duct l0 and the room. The grille 12 comprises a plurality of restricted orifices which inherently create such a pressure drop. Frictional engagement of driver 49 with turntable 6'. as seen in Fig. 3 causes counter-clo'ckwise rotation of threaded shaft i5 and closing of the grille openings, While engagement of driver IS with turntable i3 causes reversal of thisaotion. f v

In orderto permit the alternate engagement of a driver with the turntables the shaft 2 is shiitably mounted as follows. The inner end of the shaft is pivotally mounted as by a ball 25 held in a socket 25. The outer end of shaft 2| is loosely journaled in a bearing 2? at the free end of a bimetallic bar 28 having one end fixed by a pivot pin 29 projecting from plate H. The bar is provided with an extension 38 provided With a forked end 3| straddling an eccentric 32 mounted on plate whereby the position of the bar may be adjusted, thus affecting the position of shaft 2 I. As the room air is caused to circulate about the bar 28 the bar is warped up or down by the effect of the ambient temperature of the room, thus causing the driver to engage the upper or lower turntable to regulate the supply of conditioned air. Preferably the eccentric 32 is provided with a graduated dial 3-3 to aid in making desired adjustments.

The operative connection between bar 23 and extension 30 is preferably yieldable so that the operation of the eccentric 32 can not impose suficient pressure on the driver through its engagement with a turntable to stall the turbine 22 and shaft 2|. A collar 34 is secured to extension 32. A pair of spaced fingers 35 are secured to bar 28 and straddle extension 39. A pin 36 is secured to the fingers 35 and penetrates an elongated slot 31 provided in extension 353. A spring 33 positioned concentrically of extension and ioperative engagement with collar 34 and fingers 35 urges pin 35 to the left in Fig. 12. When the pressure of the driver on the turntable exceeds a predetermined value the spring yields and the pin 36 tilts in the slot 37 and the bar 28 and extension 39 become disalignedthereby limiting the force that may be imparted to shaft 2! by cperation of eccentric 32.

The pivot end of shaft 2| may be fixed in rel ative position for the device as so far described, but I prefer to make it automatically shiftable axially of the shaft in order to provide yearround control of the grille. For this reason shaft 2| is slidable axially of bearing 2'? and the socket 255 is mounted on the free end of a horseshoe-shaped bimetallic member 4% having its other end fixed to an immovable bracket 2|. In the summer the supply of cooled air in duct It! causes contraction of member ii? to move socket 25 forward to cause engagement of driver it seen in Fig. 3, while the heated air supplied Winter expands member id to move socket 25 rearward to cause engagement of driver 20 as seen in Fig. 4. A stationary el ment G2 is provided with spaced lugs 43 and it. The socket 26 is provided with a projection I35 located in same plane as the lugs 23 and 44. Engagement of the projection 45 with lugs and M limits movement of the shaft 2|. Shaft 2| will always rotate in the same direction, but the drivers are located on opposite sides of the shaft and the direction of rotation of shaft it will be dependent upon which driver is engaging a turntable and upon which turntable is being engaged. Bimetallic bar 28 selects the turntable and bimetallic member lil selects the driver. Bar is sensitive to room temperature and member ts is sensitive to the temperature of air being delivered in the duct II].

The member 49 may be positioned so that is change in shape in response to duct temperature change produces the effect described above of moving the shaft 2| to the right and left in Fig. 1% or it may produce an additional movement. When cold air is supplied in duct la the pivot 25 may be moved downward as Well as forward. The downward movement raises the temperature required for movement of shaft 2| upward under the influence of bimetallic bar 28. By properly shaping and positioning member to the amount of change in control point for summer operation can be pre-selected.

Operation-Let us assume that a room is to be kept at 72 F. winter and summer. In summer member 45 contracts to cause driver id to be in position to engage either turntable. Bimetallic bar 28 When cool engages driver ll with one turntable and when warm it causes driver 22 to engage the other turntable. There is thus provided a driving means for raising or lowering the grille l2. The turbine 22 rotates continuously and when the grille has reached the limit of its movement in one direction the member it slips relative to the associated turntable. The room temperature desired may be selected by operation of the dial 31 When Winter comes and heated air is supplied member ii? expands and driver 22' is moved in engaging position.

Figs. 6, '7, and 8 illustrate a'modified form of the device. An air supply duct 5e delivers air to the device. The device separates the discharge end of the duct as into two portions, namely the main air discharge passage 52 and an auxiliary passage 54 housing the control apparatus. A pair of shutters 56 and 5'! are hinged in the dim" charge passage 52. When these shutters are open a substantially unrestricted flow of air into the room is permitted. When these shutters are closed practically all movement of air through the main discharge passage is stopped although a negligible amount of air may enter the room through the auxiliary passage 54 in order to actuate the control apparatus.

The control apparatus comprises a rotatable turbine 58 positioned in the auxiliary passage 54 and a spool E8 adapted to be driven through gear means to be described and to selectively wind up and unwind a pair of wires 62 and 64. Wire 52 is secured to a mid portion of shutter 51. Wire 64 travels around a pulley member 66 and is se cured to a mid portion of the shutter 56. When the spool 69 is rotated in one direction the wires 62 and 64 are wound around the spool to draw the shutter members towards their closed position. When the spool is rotated in the opposite direction the wire is unwound and gravity moves shutter 5'! to its open position and shutter 56 is moved to its open position by a s ring 88. The mov -ment of air thro gh the main discharge passage 52 su plements the effect of gravity and the s ring 68 in opening the shutters. The turbine 58 is ke ed to a rotatable shaft IE3. Movement of air thro gh the a xil ary passage 5 3 rotates the t rbine and shaft 15. A second shaft 12 is rotatabl mount d in a stationary bracket 4 and extends transver ely of the passage 55. The s aft 72 carries a pair of spaced oinions 76 and 18 which are connected by a member. 15 to form a unitary st ucture. Suitable gearing including a pinion l9, ear 80, pinion 3!, gear 82, pinion 83 and ear 84 serves as a motion transmitting connection between the turbine shaft l0 and the second shaft '52 so that the shaft 12 is rotated in res onse to rotation of the turbine 58. Stub sha ts 85 and 26 may be provided to support portions of the intermediate gearing referred to above. A shaft 51 is. rotatably mounted in the housing forming passage 54 and in a station rv bracket 38. The shaft Bl extends transve selv of the shaft 12. The spool en previously referred to is pinned to the shaft 8? to rotate therewith. Apair of similar face gears and 9| are slidably keyed on the shaft 8! and-have a atria-17s diameter slightly'less than the distance "between the pinionsi'lfi and 18 so that relative movements between the pinions 16 and 18 and the face gears 90 and ill may cause one of the face gears to be driven by one of the .pinions. The pinionslt and 18 are similar in operationto the drivers 19 and 20 discussed in the first form of the invention. The face gears 90 and BI are similar in operation to the turntables I! and i8 disclosed in the first form of the invention.

Temperature responsive control means are provided to move the pinions i5 and 18 axially of the shaft "12 in response to changes. in room temperature and to move the face gears 90 and BI transversely of the shaft E2 in response to changes in temperature of theair being supplied by the duct 5! The face gears 95! and BI are each secured to a collar 92 which is splined on the shaft 8'5. 'A temperature responsive bimetallic element 94 is secured at one end to the housing forming the passage 5d at 95. The opposite end of the bimetallic element 94 is received in an annular groove 96 provided in collar 92. Deformation of the bimetallic element 94 which will occur in response to changes in the temperature of the air being delivered through the passage 54 will move the face gears 90 and 9! axially on the shaft 8? so that eitherone or the other will be in the proper position to engage one of the pinions 16 or 18. A bimetallic element 98 one end secured at H!!! to a stationary object and is exposed to room temperature. Deformation of bimetallic element 93 as a result of changes in room temperature will through a link E92 and bell crank I04 slide the member 'ifi and pinions l6 and T8 axially of the shaft H2. The link 682 is secured to one end of the bimetallic element 58 and to one end of the bell crank. The outer end of the bell crank MM is received in an annular slot [03 provided in the member in the operation of this form of the invention with the parts in the positions illustrated in Fig. 7. The

rotation of the turbine 58 induced by the movement of air through the passage 54 wi l rotate shaft 18- and through gearing rotate shaft '52 and pinion 18. Pinion is will rotate face gear til, shaft 8'! and spool fill to control to wires 52 and 64 connected to the shutters 56 and 51. When the room tem erature has chan ed sufficiently to cause the bimetallic member 98 to move downward the member wi l be shifted to the right in 'l and pinion 76 will be in en agement with the facegear 913. The drive from the 58 to the face gear SH will then. be through the inion f6 instead of pinion l8 and the direction of rotation of the face ear 99 and s ool iii! will be reversed. This wi l move the shutters 56 and 5'! in the reverse direction to control the admission of air to the room from the duct 50. In the summer when cool air is supp ied by the duct instead of Warm air the bimetallic element 54 will be deformed downwardly in Fig. '7 thereby shifting the face gear es into po ition for engagement by the pinions 16 or '58. This changefrom one face gear to the other will reverse the driving effect of each pinion, as, for exam le, the pinion E8 in drivin the face gear Bil causes the shutters 55 and 51 to open and will when driving the face gear 9i cause the shutters to close. The relationship between the room temperature and the opening of the shutter is thns reversed by the bimeta lic element 9A. A calibrated control knob I516 mav be provided for manual control of the bimetallic member 93 so that the temperatures at which a movement of the pinions It and 18 will be caused may be varied to suit individual requirements.

A second modified form of the invention is illustrated in Figs. 9, l0 and 11. This form is substantially the same as the form illustrated in Figs. 6, 7 and 8 except that the driving mechanism has been altered and the room temperature sensitive thermostat moves the drive pinion alternately to engage one or the other of a pair of face gears while the air supply temperature sensitive thermostat shifts the driving pinions axially instead of shifting the face gears. In this form of the invention a main air supply passage 52 and an auxiliary air passage 54 are provided. Shutters 56 and El are provided and operated by wires 62 and 64. A turbine 20s is pinned to a shaft 202 and adapted to be rotated by the movement of air through the passage 5%. The shaft 202 is rotatably mounted in brackets 2M and 206. An elongated pinion pinned to the shaft 292. A second shaft 2H3 is provided in parallel relationship with the shaft 232 and has one end pivotally mounted in 2l2 on the bracket 2%. The opposite end of the shaft 2) is retained for lateral stability in a slot (not shown) in a stationary bracket 2M. The shaft 210 may thus rotate in a vertical plane only about the shaft 2l2. Member 2H5 is slidably splined on the shaft 2l0 and has a pair of spaced pinions 2!!! and H9 formed thereon and a gear 22%! adapted to engage the elongated pinion 288 is formed thereon. Ro-

tation of the turbine 205! is thus transmitted through the pinion 288 and gear 22!) tovcause rotation of the driving pinions H8 and 259. A vertical shaft 2'22 is rotatably mounted and has secured thereto a pair of spaced face gears 22d and 225. A spool 228 is rotatably mounted on a stub shaft 236. Rotation of the face gears 224 or 226 is transmitted to the spool 228 through suitable gearing including a pinion 232 pinned to shaft 222, a gear 233, a pinion 234 and a gear 235 pinned to stub shaft 239.

A pair of thermostats are provided as in the previous forms of the invention to control the relative positions of the face gears 224 and 226 and the pinions 218 and m. A room temperature responsive bimetallic element 286 has one end secured at 231 to a relatively stationary shaft 238. The other end of the bimetallic element 236 is connected by a link 239 to the free end of shaft 2H5 adiacent the bracket 2M. Deformation of the bimetallic element 236 in response to changes in room temperature will thus rotate the shaft 2H about the pivot M2 and selectively engage a driving pinion with one or the other of the face gears 224 or 226. A second bimetallic element 268 is secured at 269 to the bracket 2% and has its free end received in an annular slot 244 provided in the member 2H3. Deformation of the bimetallic element 2 6 Will move the member H8 and pinions M8 and 2H) axially on the shaft 2m to engage one or the other of the driving pinions with a face gear.

In a manner similar to that described in the previous form of the invention the constant rotation of the turbine 25% is used to open and close the shutters. By means of bimetallic element 236 the direction of motion is controlled by room temperature. By means of bimetallic element 2% the effect of room temperature on the movement of the shuttersis reversed when cool air is supplied by the duct 5% instead of warm air. A manually operable calibrated knob 25% is provided on the end of a threaded shaft 25!. A nut 252 is pivotalh mountedon a lever 253 connected 7 to the shaft 238. Rotation of the calibrated knob 25% thus induces a change in position of the bimetallic element 236. There is thus provided a manual control so that the aparatus may be made responsive to a desired room temperature.

It is to be appreciated that in order to illustrate the device clearly I have exaggerated certain parts which in actual practice would be relatively thinner or lighter in construction, and various details may be otherwise altered as desired by those skilled in the art. All such modifications in detail and arrangement as come within the scope of the following claims are considered a part of my invention.

I claim:

1. An apparatus for controlling the admission of air to a room comprising a member having an air passage therein associated with a source of supply, a first means to restrict said passage, a second means substantially constantly driven by air supplied to said passage, an operative connection between said second means and said first means through which said first means is driven, said operative connection including a releasable clutch device adapted to interrupt said operative connection when released, temperature respon sive means to selectively engage and release said clutch device in response to changes in room temperature and temperature responsive reversing means adapted to reverse the drive or" said first means by said second means in response to predetermined changes in the ternerature oi the air in said passage.

An apparatus for con rolling the admission of air to a room comprising a member having an air passage therein associated with source of supply, a firs insane to restrict pas a second means substantially constantly driven by air supplied to said passage, a first driven memher, a second driven member, third means to ransmit drive from either of said members to said first means, a fourth to operatively associate said second means with said first memher under a first set of temperature conditions and to operatively associate said second with said second member under a second set of temperature conditions, said second means being ted to drive said first member in one direction when associated therewith and to d ive second me nber in an opposite direction when associated with the second member whereby the move. ut of said first means reversed for different sets temperature conditions. 3. An apparatus for controlling the admission of air to a room comprising a member having an air passage therein associated with a source of supply, a first means to restrict said passage, a second means substantially constantly driven by air supplied to said passage, a first driven member, a second driven member, a third means to transmit drive from either of said members to said first means, a fourth means to operatively associate said second means with said first member under a first set of temperature conditions and to operatively associate said second means with said second member under a second set of temperature conditions, said second means being adapted to drive said first member in one direction when associated therewith and to drive said second member in an opposite direction when associated with the second member whereby the movement of said first means is reversed for difierent sets of temperature conditions and a fifth means responsive to predetermined temperature. conditions of the air in said passage and operative to reverse the drive of said second means on said members so that under said first set of temperature conditions said second means is driving one of said members in a first direction and under said second set of temperature conditions said second means is driving said member in a second direction when the air in said passage fulfills the predetermined temperature conditions.

4. An apparatus for controlling the admission or" air to a room comprising a member having an air passage therein associated with a source of supply, a first movable means to restrict said passage, a turbine driven by air supplied to said passage and adapted to move said first means, a pair of rotatable spaced driving members, a pair of rotatable spaced driven members, said driving members and said driven members being relatively shiftable in a first and second direction, thermostatic means to selectively shift said members in said first and second directions and engage one of said driving members with one of said driven members, said thermostatic means comprising a first bimetai element exposed to room temperature and adapted to shift said members in said first direction and a second bimetal element exposed to air in said passage and adapted to shift said members in said second direction.

5. An apparatus for controlling the admission of air to a room comprising a member having an air passage therein associated with a source of supply, a first movable means to restrict said passage, a turbine driven by air supplied to said passage, a first pair of spaced coaxial gears operatively connected to said first means, a second pair oi spaced coaxial gears operatively connected to said turbine and adapted to be rotated thereby, a first thermostatic element exposed to room temperature, means operatively connecting said thermostatic element to said second pair of gears and adapted to position one of said second pair of gears for engagement with one of said first pair of gears under a first set of room temperature conditions and to position the other of said second pair of gears for engagement with one of said first pair of gears under a second set of room temperature conditions, and a second thermostatic element exposed to air in said passage and adapted to position one or the other of said first pair of gears for said engagement depending upon the temperature of the air in said passage whereby the position of said first means is dependent upon the temperature of the air in said passage and the temperature of the air in said room.

6. An apparatus for controlling the admission of air to a room comprising a member having an air passage therein associated with a source of supply, a first movable means to restrict said passage, a turbine driven by air supplied to said passage, a firstpair of spaced coaxial gears operatively connected to said first means, a secondpair of spaced coaxial gears operatively connected to said turbine and adapted to be rotated thereby, a first thermostatic element exposed to the air in said passage, means operatively connecting said thermostatic element to said second pair of gears and adapted to select one of said second pair of gears for engagement with one of said first pair of gears under a first set of air supply temperature conditions and to select the other of said second pair of gears for engagement with one of said first pair of gears under a second set of air supply temperature conditions, and a second thermostatic element areas; 75

exposed to room temperature'and adapted to select one of said first pair of gears for engagement with one of said second pair of gearsdepending upon the temperature of the room wherebythe position: of saidnfirst means is dependent upon the temperature of the .air inzsaid passage and the temperature of the air linhsaid room.

'7.'In an apparatus for controlling the discharge ofvair from an air supply passage to a room, means dividing theoutlet for said passage into first and second air discharge openings, damper means operable to restrict in varying degree the discharge of air through said first opening from a source of supply of air, means deriving energy :from the movement of air supplied to'said second-opening to move said damper means comprising a turbine adapted to be rotated by the force of the air supplied to said second opening, ashaft carrying said turbine, means for translating rotation of said shaft to movement of said damper means, said last mentioned means comprising first and second driving elements carried by said shaft, a pair of spaced turntables associated with said damper means and between which said driving elements may be selectively located, the spacing of said turntables being such that the selected driving element may only engage one of said turntables at a time, means for shifting the relative position of said shaft and said turntables automatically upon change of supply from heated to cooled air or vice versa to move one of the other of said driving elements into a position between said turntables, means so mounting said shaft as to permit alternate engagement of the driving element located between said turntables with one or the other of said turntables, said last means comprising a journal supporting one end of said shaft, a bimetallic element carrying said journal and exposed to space to which air is being supplied to shift the position of said journal automatically in response to predetermined temperature conditions in the space to which air is being supplied, and means for adjusting the position of said bimetallic element so as to vary the temperature conditions to which said bimetallic element will respond.

8. In an apparatus for controlling the discharge of air from an air supply passage to a room, means dividing the outlet for said passage into first and second air discharge openings, damper means operable to restrict in varying degree the discharge of air through said first opening from a source of supply of air, means deriving energ from the movement of air supplied to said second opening to move said damper means comprising a turbine adapted to be retated by the force of the air supplied to said second opening, a shaft carrying said turbine, means for translating rotation of said shaft to movement of said damper means, said last mentioned means comprsing first and second driving elements carried by said shaft, a pair of spaced turntables associated with said damper means and between which said driving elements may be selectively located, the spacing of said turntables being such that the selected driving element may only engage one of sa d turntables at a time, means for shifting the relative position of said shaft and said turntables automatically upon change of supply from heated to cooled air or vice versa to move one or the other of said driving elements into position to engage said turntables on opposite sides of the turntable axis whereby the same movement of said bimetallic element causes movement of said damper means in opposite directions depending on whichxofsaid driving elements is in engage:- ment, means so mounting said shaft as to per.- mit' alternate engagement of the driving element located between said turntables with .one or the'other of said-turntables, said last means comprising a journal supporting one end .of said shaft,-a bimetallic element carrying said journal and exposed to space to which air is being sup,- piied toshift theposition of said journal automatically in response to predetermined tempera.- ture conditions in the space ,to which air is being supplied, and means for adjusting the position of :said bimetallic elementso as to vary the temperatureconditions to which said bimetallic element will respond.

;9.In anapparatus for controlling the dischare of air from an air supply passage to a room, meansdividing the outlet for said passage into first andqsecond air discharge openings, damper'means operable to restrict in varying degree the discharge of air throughsaid first opening from a source of supply or air, means deriving energy from the movement of air supplied to said second opening to move said damper means comprising a turbine adapted to be rotated by theforce of the air supplied to said second opening, a shaft carrying said turbine, means for translating rotation of said shaft to movement of said damper means, said last mentioned means 'compr'sing first and second driving elements carried by said shaft, a pair of spaced turntables associated with said damper means and between which said driving elements may be selectively located, the spacing oi's-aid turntables being such that the selected driving element may only engage one of said turntables at a time, means for shifting the relative position of said shaft and said turntables automatically upon change of supply from heated to cooled air or vice versa to move one or" the other of said driving elements into posit'onto engage said turntables on opposite sides of the turntable axis, said last means comprising a bimetallic element supporting one end of said shaft and exposed to the air supplied to said grille, means so mounting said shaft as to permit alternate engagement of the driving element located between said turntables with one or-the other of said turntables, said last means comprising a journal supporting the other end of-said shaft, abimetallic element carrying said journal and exposed to space to which air is being" suppl'ed to shift the position of said journal automatically in response to predetermined temperature conditions in the space to which air is being supplied, and means for adjusting the position of said bimetallic element so as to vary the temperature cond'tions to which said bimetallic element will respond.

10. In an apparatus for controlling the discharge of air from an air supply passage to a room, means dividing the outlet for said passage into first and second air discharge openings, damper means operable to restrict in Varying degree the discharge of air from said first opening, an air driven turbine mechanism deriving energy from the air discharged from said second opening and operable to utilize said energy to locate said damper means, room temperature responsive control means operable to selectively drivingly connect and disconnect said turbine and said damper means, and air passage tem- 7 perature responsive control means operable to 11 reverse the driving relation between said turbine and said damper means in response to predetermined temperature changes of the air in said passage.

11. An apparatus for controlling the discharge of air from an air supply passage to a room, means dividing the outlet for said passage into first and second discharge openings, damper means operable to restrict said first opening, a driving means utilizing the static pressure difference between said passage and said room to actuate said damper means, said driving means comprising a reaction turbine adapted to be rotated by air discharged through said second opening from said passage and clutch means operable to selectively drivingly connect and disconnect said turbine and said damper.

12. An apparatus for controlling the admission of air to a room comprising a member having an air passage therein associated with a source of supply, a first means to restrict said passage and the discharge of air therefrom, a reaction turbine deriving energy from the pressure drop across said first means and a second means selectively operably connecting and disconnecting said turbine with said first means in response to temperature changes.

13. In an apparatus for controlling the discharge of air from an air supply passage to a room, means dividing the outlet for said passage into first and second air discharge openings, damper means to restrict said first opening, an air driven reaction turbine deriving energy from the pressure drop across said damper, an operative connection between said turbine and said damper means through which said damper means is driven, said operative connection including a releasable clutch device adapted to interrupt said operative connection when released and temperature responsive means to selectively engage and release said clutch device in response to changes in room temperature.

14. In an apparatus for controlling the discharge of air from an air supply passage to a room, means dividing the outlet for said passage into first and second air discharge openings, damper means operable to restrict in varying degree the discharge of air through said first opening, means deriving energy from the movement of air supplied to said second opening to move said damper means comprising a turbine adapted to be rotated by the force of air supplied to said second opening, a shaft carrying said turbine, means for translating rotation of said shaft to movement of said damper means, said last-mentioned means comprising a driving wheel carried by said shaft, a pair of spaced turntables associated with said damper means and between which said wheel is located, the spacing of said turntables being such that said wheel may only engage one of said turntables at a time, means so mounting said shaft as to permit alternate engagement of said driving wheel with one or the other of said turntables, said last means comprising a journal supporting one end of said shaft, a bimetallic element carrying said journal and exposed to space to which air is being supplied to shift the position of said journal automatically in response to predetermined temperature conditions in the space to which air is being supplied, and means for adjusting the position of said bimetallic element so as to vary the temperature conditions to which said bimetallic element will respond.

15. In an apparatus for controlling the discharge of air from an air supply passage to a room, means dividing the outlet for said passage into first and second air discharge openings, damper means operable to restrict in varying degree the discharge of air through said first opening, a second means deriving energy from the movement of air supplied to said second opening to move said damper means and comprising a reaction turbine adapted to derive energy for rotation from the pressure drop created by said damper means, drive transmitting means associated with said turbine and said damper means and adapted to move said damper means in response to rotation of said turbine, said drive transmitting means comprising a pair of rotatable elements in engagement with each other and positioned in planes at right angles to each other, one or" said elements being operatively connected to said turbine and the other of said elements being operatively connected to said damper means.

ALWIN B. NEWTON.

REFERENCES CITED The following references are of record in the file of this patent:

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